Valve seat grinder stone carrier



0d 7, 1941- L.; F. DENsMoRE l 2,258,505

VALVE SEAT GRINDER STONE CARRER Filed May 1, 1941 INVENTOR. L ROY F. DENSMURE.

A am) Q y,

ATTORNEY.

Patented Oct. 7, 1941 I VALVE SEAT GRINDER STONE CARRIER Leroy F. Densmore, Kenosha, Wis., assigner to Snap-n Tools..Corporation, Kenosha, Wis.

Application May 1, 1941, Serial No. 391,285

8 Claims.

This invention relatesto valve seat grinding machines and more particularly to valve seat grinder stone carriers, although certain features thereof may be employed with equal advantage for other purposes.

It contemplates more especially the provision of a valve grinding stone carrier assembly having improved heat dissipating expedients con` ducive to better operation, longer wear and increased eciency.

Numerous types of valve grinding stone carrier assemblies have heretofore been proposed, and many of these are expensive in construction, develop appreciable heat owing to high speed rotation relative to guide pilots and otherwise prove Vunsatisfactory from a functional standpoint. Assemblies of this type that involve a sleeve bearing. that rotates therewith relative to a pilot serving as a positioning guide. This relative rotation between a relatively long sleeve and a pilot at high speeds, generates appreciable heat that must be effectively dissipated. It is intended, therefore, to provideeifective heat dissipating expedients permitting relative rotation of the sleeve bearing relative to the rpilot or guide without elevating the temperature ofthe coacting elements to any detrimental degree.

One object of the present inventionis. to improve the construction and simplify the operation of devices of the character mentioned.

Another object is to provide improved means for maintaining the inner and outer sleeves of a stone carrier in relative rotation with a pilot or guide without elevating the temperature of the coacting elements to a detrimental degree.

Still another object is to provide improved means for maintaining the inner sleeve of a valve grinding stone carrier, rotatable relative to the pilot or guide. customarilyused in ,conjunction therewith without developing any detrimental degree of heat that would impair operating eiiiciency and longevity.

A further object is to provide improved heat dissipating means in` a valve `grinding V'stone carrier to maintain a satisfactoryy temperature under conditions of prolonged high speed operation. .Y

A still further object is to provide improved heat dissipating expedients between the outer and inner sleeve of a valve grinding stone carrier assembly. A

Still a further object is to .provide anfimproved elevation in temperature under prolonged conditions of high speed operation.

Other objects and advantages will appear from the following description of an illustrative ernbodiment of the present invention.

In the drawing: y

Figure 1 is a side view in elevation of a driver operatively connected to a Valve grinder stone carrier with `a portion shown in section to clarify the knuckle connection therebetween.

Figure 2 is a front View in elevation of a grinding stone embodying features of the present invention.

Figure 3 is a sectional front view in elevation of a valve grinding stone carrier embodying -features of the present invention. A

Figure l is a sectional view taken substantially along line IV-V of Figure 2.

Figure 5 is ,a sectional view taken substantially along line if-V of lFigure 2. Y

Figure 6 is .a sectional view taken substantially along line VI-VI of Figure 2.

Figure 7 is a top plan view of Ya'valve grinding stone ,carrier shown in` Figures 1 Aand 2 4showing f the knuckle engaging socket.

The structure selected is illustrated in connection with a power hand'driver IU thaty terminates in a polygonal knucklel `II having its sides converge to a point `I2 so that its largestdiameter is removed or spaced therefrom. The driver knuckle I I is adapted to be telescopically received in a correspondingly sized polygonal socket I3 broached or otherwise provided in a tubular tool holder ring I4. The tool holder ring I4 is provided with a cylindrical surface I5 of somewhat smaller diameter than the larger sleeve recess I6 which terminates in a peripheral shoulder Il serving as a limit therefor. The cylindrical surface l5 with .its shoulder Il are l,provided in an elongated tubular exterior sleeve I8 that is pressed or otherwise telescoped over anV internal sleeve I9.

To this end, the inside bore 20 ofl theouter sleeve I8 substantially corresponds with the exterior diameterof the internal cylindrical sleeve I9 to provide for a tight Vor pressed t therebe tween. To preclude any possible separation between the tubular cap I4 and the outer sleeve I8, diametrically opposed pins 2|, in this instance two, are disposed radially through somewhat smaller and aligned apertures k22---23 `provided in thel cap I4 and outer sleeve i8, respectively, for press-t engagement to connect the ring lli with the outer sleeve I8. This precludes any separation between the driving `ring `Ill andthe outer sleeve I8 so that the latter will rotate responsive to corresponding rotation of the driver knuckle II that is a complement of the socket I3.

The outer sleeve I8 is cylindrical in configuration and has an annular groove 24 exteriorly provided proximate to the lower end thereof. The annular groove 24 has inwardly converging sides 26-21 and with the annular groove 24 present a plurality of circumferentially spaced rectangular openings 28, in this instance six in number. The

annular groove openings 28 communicate with.

longitudinally extending vanes, flutes or slots 29 provided along the interior bore 20 thereof to4 effort to dissipate the heat that is generated internally by friction with the pilot guide (not shown) as will appear more fully hereinafter. It should be noted that the outer sleeve I8 rotates with the inner sleeve I9 until they are connected by diametrically aligned points 3 I, in this instance two, that are pressed through somewhat smaller aligned apertures 32-33 provided in the outer and inner sleeves I8 and I9, respectively.

As shown, the inner sleeve I9 terminates in an enlarged circular ange 34 having an axially extending tubular boss 35 which is exteriorly threaded as at 36 to mesh with corresponding threads provided in a metallic bushing 31 comprising the core of a grinding wheel 38. The reduced tubular boss 35 together with the inner sleeves I9 have an aligned axial bore 39 which extends toward the upper tool holder ring I4 to communicate with a counterbore 40 that is somewhat smaller in diameter than the tool holder ring receivingv recess I6 to communicate therewith to define thel peripheral shoulder I'I serving as a seat for the tool holder ring I4.

An elongated pilot stem or guide receiving sleeve bearing 4I is press-fitted into the inner sleeve bore 39 to extend inwardly for a substantial portion of the inner sleeve I9. The sleeve 4I rotates with the outer and inner sleeves I8--I 9 and relative to a pilot guide or stem that extends from the valve stem bore in an engine cylinder head or from a grinding wheel dressing stand. This relative rotation generates appreciable heat which is conducted from the sleeve bearing 4I to the inner sleeve I9 and to the outer sleeve I8 for dissipation and cooling by the air circulating therebetween through the outer sleeve slot or ute passages 28-29-30. Y

A driver knuckle engaging disc 42 is conned for axial movement within the counterbore 49 to engage the lower circular edge of the tool holder ring I4. The disc 42 is yieldingly urged toward the tool holder ring I4 by a coil spring 43 confined in an end bore 44 of the inner sleeve I9 to rest against the sleeve bearing 4 I. In order to center the driver knuckle II on the spring supporting disc 42, the latter is provided with an l I3, the latter is provided with an annular groove 46 proximate to the upper open edge 47 thereof to receive a split wire ring 48. The split wire ring 48 is of somewhat lesser diameter than the annular groove 46 so that the inner circumferential edge thereof will lie within the exterior coniines of the socket I3 with suihcient space in the annular groove 46 to permit the outward expansion of the ring 48. Consequently, the largest diameter of the driver knucklell will be somewhat greater than the normal inside diameter of the split wire ring 48 to cause the latter to expand responsive to the displacement of the driver knuckle II therethrough for registry with the socket I3 when the driver knuckle tip l2 is withinl the axial aperture 45 of the spring supported disc 42.

In this position the larger diameter of the knuckle II will pass beyond the split ring 48 which will then contract to its normal diameter over the driver knuckle II and precludes its accidental removal from the socket I3 and still permit its insertion therein without any appreciable diiculty. This arrangement affords a simple and inexpensive spring retainer for the driver knuckle I I when it is in its operative position of full registry with the outer sleeve holder cap socket I3. With the arrangement of parts above described, simple and dependable expedients have been provided to maintain the driver knuckle II in registry with the socket I3 against accidental displacement for positive rotation of the outer sleeve I8 and inner sleeve I9 which are air cooled to effectively dissipate generated heat. The outer sleeve is preferably though not essentially constructed of high heat conducting material such as aluminum to hasten the heat dissipation in conjunction with the air circulating expedient provided therein.

Various changes may be made in the embodiment of the invention herein specifically described without departing from the invention or sacrificing any of the features or advantages thereof and nothing herein 'shall be construed aslimitations upon the invention, its concept or structural embodiment as to the whole or any part thereof except as defined in the appended claims.

' Iclaim:

1. In a device of the character described, the combination with an outer driving sleeve body, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve body for rotation therewith, and means in said outer driving sleeve body to circulate air therein for dissipating generated heat responsive to the rotation thereof.

2. In a device of the character described, the combination with an outer driving sleeve body, an inner sleeve connected toV said outer sleeve body for rotation therewith, and means between said outer driving sleeve and inner sleeve tocirculate air therein for dissipating generated heat responsive to the rotation thereof.

3. In a device of the character described, the combination with an outer driving sleeve body, an inner sleeve connected to said outer sleeve body for rotation therewith, and elongated air vanes between said outer driving sleeve and inner sleeve to circulate air therein for dissipating generated heat responsive to the rotation thereof.

4. In a device of the character described, the combination with an outer driving sleeve having an annular groove proximate to one end thereof, there being elongated`passages in said sleevevto communicate with said annular groove, said vsleeve having openings or ports therein proximate to the other end thereof to communicate with said air passages, and means for rotating said sleeve to effect the passage of air through said passages responsive to the rotation thereof.

5. In a device of the character described, the combination with an outer driving sleeve having an internal bore, there being an annular groove proximate to one end thereof, there being elongated passages in said internal bore of said sleeve to communicate With saidvannular groove, said sleeve having openings or ports therein proximate to the other end thereof to communicate with said air passages, and means for rotating said sleeve to effect the passage of air through said passages responsive to the rotation thereof.

6. In a device of the character described, the combination with an outer driving sleeve having an internal bore, there being an annular groove proximate to one end thereof, there being elongated passages in said internal bore of said sleeve to communicate with said annular groove, said sleeve having openings or ports therein proximate to the other end thereof to communicate with said air passages, an internal sleeve pressed into said outer sleeve bore to confront said elongated passages, and means for rotating said sleeve to effect the passage of air through said passages responsive to the rotation thereof.

7. In a device of the character described, the combination with an outer driving sleeve having an internal bore, there being an annular groove proximate to one end thereof, there being elongated passages in said internal bore of said sleeve to communicate with said annular groove, said sleeve having openings or ports therein proximate to the other end thereof to communicate with said air passages, an internal sleeve pressed into said outer sleeve bore to confront said elongated passages, a pilot stem receiving sleeve bearing pressed into said inner sleeve for rotation therewith relative Ato a pilot stem, and means for rotating said sleeve to effect the passage of air through said passages responsive to the rotation thereof.

8. In a device of the character described, the combination with an outer driving sleeve having an internal bore, there being an annular groove proximate to one end thereof, there being elongated passages in said internal bore of said sleeve to communicate with said annular groove, said sleeve having openings or ports therein proximate to the other end thereof to communicate with said air passages, an internal sleeve pressed into said outer sleeve bore to confront said elongated passages, a pilot stem receiving sleeve bearing pressed into said inner sleeve for rotation therewith relative to a pilot stem, a socket in the driving end of said outer sleeve, and means complemental to said outer sleeve socket for r0- tating said sleeve to effect the passage of air through said passages responsive to the rotation thereof.

LEROY F. DENSMORE. 

